If you drop a 2.2kg ball from the top of a 42m high building, how fast will it be going just before it hits the ground? Round to the nearest tenth and include the appropriate unit

Given

This is a free fall problem where we have information about the mass, initial velocity and initial height of the object.

m = 2.2 kg

h = 42m

g = 9.8m/s2

vo = 0 m/s

The data given were: mass, height, initial velocity and gravity, which is already known.

Procedure

to solve this problem we rely on the free fall equations as follows.

This equation relates the final velocity to the initial velocity, gravity and height.

Using the above equation and replacing the values we can proceed to calculate.

The final velocity would be 28.7 m/s

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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